Cisco Network Registrar Sample Configuration
You can use the following information to set up Cisco Network Registrar in a trial configuration. The
configuration describes DHCP-related setup only; it does not cover setting up DNS or configuring dynamic
DNS (DDNS). You should be familiar with important CNR concepts including scopes, primary and secondary
scopes, scope selection tags, client classes, and CNR policies. See the Using Network Registrar publication
for detailed information on these concepts.
In the trial configuration, you can configure CNR to perform the following operations:
•
Receive DHCP requests from a cable modem and a PC on an HFC network via a port supporting multiple
network numbers. The Cisco cBR-8 router at the headend must be configured as a forwarder (iphelper
is configured).
•
Serve IP addresses on two networks; a net-10 network (non-Internet routable) and a net-24 network
(Internet routable).
•
Tell the difference between a cable modem and a PC based on the MAC address of the device and
provide net-24 addresses to the PC and net-10 addresses to the cable modem.
•
Refuse to serve IP addresses to MAC addresses that it does not recognize.
To perform these options, you must implement the following CNR configuration items:
•
Create two scope selection tags; one for PCs, one for cable modems.
•
Create two client-classes; one for PCs , one for cable modems.
•
Create a lease policy appropriate for the cable modem devices.
•
Create a lease policy appropriate for the PC devices.
•
Create a scope containing Class A net-24 (routable) addresses.
•
Create a scope containing Class A net-10 (nonroutable) addresses.
•
Identify the scope containing the net-24 addresses as the primary scope and configure the other scope
containing the net-10 addresses as secondary to the net-24 scope.
The Cisco cBR-8 router upstream ports must be configured with the primary network address on the net-24
network; such as 24.1.1.1.
Note
•
Assign the policies to the appropriate scope.
•
Add the MAC address of the cable modem and the PC to the client-entry list.
•
Associate the PC tag with the scope containing routable addresses.
•
Associate the cable modem tag with the scope containing nonroutable addresses.
•
Associate the cable modem tag with the cable modem client-class.
•
Associate the PC tag with the PC client-class.
•
Assign the PC MAC to the PC class.
Cisco cBR Series Converged Broadband Routers Application
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Voice and Video Configuration Guide
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Cisco Network Registrar for the Cisco CMTS Routers
Cisco Network Registrar Sample Configuration
